They are everywhere. I listed something for my sister on craig's list. Got a nice email, "consider it sold. I will have my agent pick it up after you cash my certified bank check. Send me the physical address and all details of who to make the check out to."

A couple of emails from me telling him to phone so we could talk about it, first, got a response that he was away on a business trip and couldn't call, and, the second time, no response. Good riddance, I say, BUT I pity people like my sisters who wouldn't have had the savvy to suspect.